| 摘要 |
Apparatus for aerating waste water, provided with a container for waste water and a rotor which is rotatable about a substantially vertical axis ( 1 ) and the downward directed part of which can reach into the waste water, which rotor comprises blades ( 4 ) having surfaces which are orientated substantially radially and axially, wherein a surface ( 12 ) curved in the direction of rotation of the rotor is present close to the upper edge ( 8 ) of a blade ( 4 ), and wherein the curved surface close to the upper edge forms an angle of between 10° and 60° with the vertical plan of the blade.
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